Mechanical stoker.



N0. 701,!92. Patented May 27, I902.

W. FRASER.

MECHANICAL STOKER.

(Application filed Feb. 24, 1902.) (No Model.) 3 Sheets-Sheet I.

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No. 70!,l92. Patented May 27, I902. W. FRASER.

MECHANICAL STOKER.

(Application filed Feb; 2%, 1902.)

3 Sheets$heet 2,

(No Model.)

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WlTNESSES.

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N0. 70l,l92. Patented May 27, I902.

W. FRASER.

MECHANICAL STOKER.

(Application filed Feb. 24. 1902.) (No Model.) I 3 Sheets-Sheet 3.

WITNESSES. V INVENTOR. 4L% 7 zwd m: News PETERS c0 PNOTOJLITHDY, wnsmncmu, n cy UNTTnn STATES PATENT OFFICE.

\VILLIAM FRASER, OF BLACKPOOL, ENGLAND.

MECHANICAL STOKER.

SPECIFICATION forming part of Letters Patent No. 701,192, dated May 27, 1902.

Application filed February 24, 1902. Serial No. 95,423. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM FRASER, engineer, a British subject, and a resident of Blackpool, in the county of Lancaster, England, have invented certain new and useful Improvements in Mechanical Stoker's, of which the following is a specification.

This invention relates to improvements in mechanical stokers, and is designed to make the working parts more efficient and construct the stoker in a more compact form.

The invention'will be fully described with reference to the accompanying drawings.

Figure 1 is a longitudinal sectional elevation. Fig. 2 is a front elevation showing the stoker applied to a single flue. Fig. 3 is a sectional plan of the slack-distributing apparatus. Fig. 4. is a side elevation, partly broken away to show the side of the slack-receiver H.

The hopper A is constructed of sufficient height to hold the desired supply of fuel and is formed with a front opening or aperture a, through which the fuel cannot fall and through which access can be had to the feedroller 13 and the feed-plate E to remove any obstruction or object that may be fed through the hopper without removing or emptying the fuel therefrom. The fuel is directed to the feed-roller by an incline back plate D, which rests at its front edge upon the fluted feed-roller B. The hopper may be curved or otherwise shaped to clear the fittings on the boiler-front.

The feed-plate E is built up of a number of sections 6, (say about two inches wide,) mounted or pivoted upon a rod or shaft e, so that each section can be forced down independently of the other against the pressure of a spring, which holds it up in normal position against the fluted feed-rollerB. Each section 6 is supported by a spiral or other 7 of the sections 6 can'be adjusted.

spring 6 placed upon a curved rod 6 The end of the spring abuts against the front plate F, and the rod 6 projects through it. The end is screwed and a nut e placed on the end, by means of which the height or level This construction will allow of larger pieces of fuel to pass through than that for which the fuel is set, while at the same time only such sections are depressed with which the large piece comes in contact, thereby preventing a disturbance of the whole feed. As soon as such piece of fuel passes through the sections disturbed are lifted back to their proper positions by the springs.

The fluted feed-roller Bis rotated by a chain or other gearing and draws the fuel past the sectional feed-plate E.

The riddle or slack-screen G is made to swing or oscillate on a spindle or two fixed pivots g instead of having a rising-and-falling movement at the front end. It is oscillated by a tappet g on a rotating spindle. This riddle separates the slack which falls through from the larger pieces of fuel which slide down it and fall off over the end. The slack-receiver H, which catches or collects the slack that'falls through the riddle G, is suspended from the driving-shaft h, by which the star-wheels K are driven by the bevelgearing It. or inclination, being adjusted by a set pin or stud 7c at each side projecting through a curved slot in the side plate and secured by a nut 70 Above the receiver H is fitted an inclined plate L, upon which the dust and slack falls and by which it is delivered into the receiver behind the star-wheels K. This plate L is rocked or oscillated by a tappet h on the driving-shaft h. It also serves to prevent the slack falling upon the bevelgearing 7.5. The receiver H is provided with two starwheels K to project the slack over the fire. These wheels are geared in opposite directions to throw the slack onto the furnace in opposite directions, and the spring-arms of the star-wheels are made of different lengths for the purpose of giving them a difierent throw. Below the receiver H and hinged or pivoted to it is a plate M, which remains horizontal, notwithstanding the angle at which the receiver may be placed.

The dead-plate N is now made to serve the double purpose of dead-plate and pusherplate, it being given a reciprocating movement over the end of the fire-bars. Upon the reciprocating dead-plate an inside door 0 is mounted between it and the pivoted plate M It may be set at any desired angle to serve as a pusher for the fuel and toprevent the inrush of 'cold air when the outer doors 0 are opened. .The inner doors 0 are fitted with a small door or opening 0 to per-v mit of the furnace being inspected or-raked without opening the larger doors 0, the small door- 0 being of a size to admit of a rake or slicer being inserted to knock the fuel about in the furnace.

The hollow bridge S, upon which the back ends of the bars R rest, is fitted with'one, two, or more pipes S to supply air or steam (or both) thereto, and the top edge or surface of the bridge is formed with a number of passages s,through which the air (or steam) issues at both sides and is diffused behind and before the bridge. A plate S is placed to cover the passages s and extend out over them on both sides to direct or diffuse the air, as required. Steam-jets or other forcing appliances may be fitted to the pipes to increase 'the draft.

The whole apparatus may be attached to or hung upon the boiler-front or supported by brackets from the ground instead of being bolted to the boiler-front.

What Ilclaim as my invention, and desire to protect by Letters Patent, is-

1. In a mechanical stoker, a hopper for sup-- plying the fuel, a feed-roller mounted therein,

' a plate for directing the fuel to the feed-roller,

and a feed-plate formed of a plurality of spring-return sections mounted in suitable relation to said feed -roller, substantially as shown and described.

2. In a mechanical stoker, in combination with a hopper for supplying the fuel, of a feedroller mountedtherein, a plate for directing the fuel to the feed-roller, a feed-plate formed of a plurality of movable sections and arranged in suitable relation to the feed-roller, means for separating the slack from the fuel after its passage from the feedplate, and mechanism for delivering the slack and fuel separately to the fire.

3. In a mechanical stoker, a hopper for supplying the fuel, a feed-roller mounted therein, a plate for directing the. fuel to, the feed-roller, a feed-plate formed of a plurality of sections and mounted in suitable relation to the feedroller, a riddle arranged below the feed-plate for dividing the slack from the fuel, and means for delivering the slack and fuel separately to the fire.

4. In a mechanical stoker, the combination with-a hopper for supplying the fuel, a feedroller mounted therein, and a plate for directing the fuel to the feed-roller, of a feedplate constructed of aplurality of sections and arranged in suitable relation to the feed- I roller, springs engaging the sections for normally retaining them in an elevated position, a riddle arranged below the feed-plate and adapted to separate the slack from the fuel,

a slack-receiver below the riddle, a shaft for suspending the said receiver, means mounted in the receiver for delivering the slack over the fire, and means for delivering the larger fuel to the fire.

5. In a mechanical stoker, the combination with a hopper for supplying the fuel, a feedroller therein and an inclined plate for directing the fuel to the feed-roller, of afeed-plate constructed of a plurality of sections and arranged in suitable relation to the feed-roller, means for normally retaining the sections separately in an elevated position, a riddle mounted below the feed-plate for separating the slack from the larger fuel, means for oscillating the riddle, a shaft below the riddle, a slack-receiver mounted upon the shaft and adapted to collect the slack as it falls,-a pair of rotary star-wheels mounted in the slackreceiver and adapted to deliver the slack to the fire, means for rotating the said starwheels, a reciprocating plate N fitted with doors and adapted to deliver the larger fuel to the fire, and means for reciprocating the said plate N.

6. A mechanical stoker comprising in its construction a hopper for supplying the fuel, a feed-roller arranged therein, a plate for directing the fuel to the feed-roller, a feed-plate constructed of a number of sections each capable of independent movement, springs for normally retaining the sections in an elevated position, a riddle mounted below the feedplate and adapted to separate the slack from the larger fuel, a spindle for supporting the riddle, a tappet for oscillating the riddle, a receiver mounted below the riddle and adapt ed to collect the slack, a shaft for suspending the said receiver, a pair of rotary star-wheels driven by the said shaft and mounted in the slack-receiver to distribute the slack over the fire, beveled gearing foractuating the starwheels, an inclined plate L mounted upon the receiver and upon which the slack falls,

means for oscillating the said plate L,.an adj ustable plate hinged to the said receiver, a reciprocating plate for receiving the larger fuel, doors mounted upon the reciprocating plate N and [moving therewith to push forward the fuel, and means for, reciprocating the said plate N.

7. In a mechanical stoker, the combination with ahopper, of a feed-plate mounted therein formed of aplurality of independent movable sections, means for directing the fuel to the said feed-plate, means for separating the slack from the large fuel after its passage from the feed-plate, and mechanism for delivering the slack and large fuel separately to the fire, substantially as herein shown and described.

8. In a mechanical stoker, the combination with a hopper for supplying the fuel, a feedroller mounted therein, means for directing the fuel to the feed-roller, a feed-plate army name in'the presence of two subscribing ranged in suitable relation to the feed-roller, witnesses. means for separating the slack from the fuel after its passage from the feed-plate, and 5 mechanism for delivering the slack and large \Vitnesses:

fuel separately to the fire. J. OWDEN OBRIEN,

In witness whereof I have hereunto signed 1 HARRY BARNFATHER.

WILLIAM FRASER. 

